Cita APA (7th ed.)

Gordon, C. H. (1972). Before Columbus: Links between the old world and ancient America. Turnstone Press.

Cita Chicago (17th ed.)

Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. London: Turnstone Press, 1972.

Cita MLA (8th ed.)

Gordon, Cyrus H. Before Columbus: Links Between the Old World and Ancient America. Turnstone Press, 1972.